jkstill

iTrader: (11)

Just got a 89 GXL that has a vibration that is apparently caused by the motor.

The vibration can be felt in the steering wheel at any RPM.

It does increase with RPM, and can be felt with the car in neutral or while driving.

I just replaced the plugs, and would have replaced the wires if I had any.

Planning to get some new wires soon.

Other particulars for this car:

88k miles, well maintained, one owner car.

This car revs easily to 8.5k RPM, no gas smell.

What else should I be considering for the vibration?

misterstyx69

iTrader: (142)

One thing to check is If you have the plug wires on Correctly,as that would give you a Real bad Vibration at all speeds.
Another thing to check would be the Engine Mounts,as they are made of Rubber(under those steel cups).if they break or Sheer off,then the engine will produce Vibration.You can test that by trying to rock the engine back and forth By hand.

jkstill

iTrader: (11)

Thanks, but I already double checked the plug wire orientation.

The vibration was there before I changed the plugs.

I can rock the engine back and forth a bit by grabbing on to the intake manifold and pushing and pulling it.

The whole car moves, but I can see that the motor itself is moving, maybe 1/4 inch in relation to the engine bay.

Is that too much movement?

89rx7vert

i once had a huge vibration on my old vert, it was the main pulley.
when i pulled it out it had a bent i did not notice, but this vibration was huge
vibrated the hole car!

jkstill

iTrader: (11)

This vibration is not huge, but is noticable.

Getting new plug wires today.

Any other ideas?

jkstill

iTrader: (11)

Update:

Pulled the leading plugs to check compression.

Three strong pulses on each rotor, sounds good.

Changed the plug wires, no effect.

The motor mounts seem to be fine.

Putting the car in first and slipping the clutch with a little gas hardly moves the motor at all.

Probably not the tranny mounts, as the vibration is still there with the clutch in.

What I did find though that pulling the trailing plug wires had no effect on how it ran.

There's spark jumping to the coil, but it looks somewhat weak on T1.

Do the trailing coils have a tendency to go bad?

jkstill

iTrader: (11)

The fix:

TPS adjustment
Timing adjustment (was off by 5 degrees)
"New" leading coil from a parted out T2.

Starts in a couple turns of the motor, hot or cold, and sounds good.

kens97sto171

I had a friend with a vibration problem... it ended up being the cooling fan... one of the blades had the end crack off.....fan was out of balance.
Easy to check this.. with the engine cold take remove the cooling fan bolt, then run the engine... see if the vibration is gone... DONT run the engine for too long without the cooling fan.

Ken

epic

iTrader: (3)

mybe check the motor mounts? that would be my guess. replace thos and test it out. from my exp it should stop the vib from the engine